import random
import math
import fractions

q = []
ans = []

#整数运算
def c1(q,ans):
    symbol = random.choice(['+','-','×','÷'])   #生成随机运算符号
    if symbol == '+':
        n1 = random.randint(0,10)
        n2 = random.randint(0,10)
        q.append(str(n1)+'+'+str(n2)+'=')
        ans.append(n1 + n2)
    elif symbol == '-':
        n1 = random.randint(0,10)
        n2 = random.randint(0,10)
        n1,n2 = max(n1,n2),min(n1,n2)         #保证被减数>减数
        q.append(str(n1)+'-'+str(n2)+'=')
        ans.append(n1 - n2)
    elif symbol == '×':
        n1 = random.randint(0,10)
        n2 = random.randint(0,10)
        q.append(str(n1)+'×'+str(n2)+'=')
        ans.append(n1 * n2)
    else:
        n1 = random.randint(0,10)
        if n1 == 0:
            n2 = random.randint(1,10)
        else:
            n2 = random.randint(1,n1+1)
        q.append(str(n1)+'÷'+str(n2)+'=')
        ans.append(fractions.Fraction(n1,n2))
#输出
n=k=int(input("写出你需要多少道题："))
print("题目已生成好，请去去文件里查看")
while n>0:
    c1(q,ans)
    n -= 1
    f = open("Exercises.txt",'w')
    g = open("Answers.txt",'w')
    j = 0
while j<k:
    question=q[j]
    answer=str(ans[j])
    x=j+1
    f.write("第""%d""个问题："%x)
    f.write(question)
    g.write(answer)
    f.write('\n')
    g.write('\n')
    j += 1
        
f.close()
g.close()

#检查
print("完成作业并把答案写在Answer.txt里")
yes = input("如已完成，请输入\'yes':")
if yes == 'yes' or 'y' or 'Y':
    q=open('Answer.txt')
    g=open('Answers.txt')
    x=list(q)
    y=list(g)
    o=0
    C=0
    v=[]
    i=[]
    while o<k:
        if x[o]==y[o]:
            C+=1
            t=o+1
            v.append(t)
        else:
            p=o+1
            i.append(p)
        o+=1
    X=k-C
    G=open('Grade.txt','w')
    G.write('Correct:')
    G.write(str(k))
    G.write(str(v))
    G.write('\n')
    G.write('Wrong:')
    G.write(str(k))
    G.write(str(i))
    G.close()